Hello Mummy, I'm so sorry to hear your news - I hoped you wouldn't be back on this forum with a continuation of that story 
. Hope you're bearing up ok. It's an awful thing to go through - I've had one and that broke me quite enough. Don't be afraid to take time of work and let yourself be unhappy - far better than bottling it up.
Re ttc again, I think the nurse is possibly right... Give your body time to get back in sync again and recover. MCs are traumatic for mind as well as body, and something is clearly going wrong if you've had two so close together, and your body won't be getting any stronger while it goes through this again. Do you know why you MC-ed? I mean, if it was a chromosomal thing, or similar, at least you know your body wasn't to 'blame' (horrible term, I'm sorry, but I hope you know what I mean) and perhaps you could try a bit sooner, but if it was that your uterine lining was too thin to support the foetus or your progesterone levels too low or something like that, I'd be more inclined to give your body a rest. You certainly don't want to go through this again.
Why don't you give it a month or two till you feel better physically and emotionally? Then, try and get as fit and healthy as you can: improve diet, reduce bad habits like caffeine, exercise more, sleep more, take pre-natal vits, maybe see a fertility accupuncturist or similar... Try and get your body in the best possible place to sustain a pg.
Take care 
- my thoughts are with you.